Pros
The best part is that you get to shape the direction of the company because it is in a fast-growing phase, and the management does listen to your opinion. Great culture, pay and benefits are competitive, and did I mention the free food? The company really cares about how you wanna grow within the organization and help you to achieve your goals. I also felt highly motivated because I get to learn new things every day.
Cons
This is not necessarily a bad thing, but things do change quickly in the company because the CEO believes implementing new ideas as fast as possible is the way to go, which I totally agree. However, it can be a little frustrating at times when you have to readjust to a new process. If you don't like changes, the culture is not a good fit for you.